LM3S2651 Luminary Micro, Inc, LM3S2651 Datasheet - Page 36

• Manufacturer Part Number: LM3S2651
• Description: Lm3s2651 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Architectural Overview
1.4.4.4
1.4.5
1.4.5.1
1.4.5.2
36
The I
devices, LCDs, tone generators, and so on. The I
diagnostic purposes in product development and manufacture.
The LM3S2651 controller includes one I
IC devices over an I
and read) data.
Devices on the I
both sending and receiving data as either a master or a slave, and also supports the simultaneous
operation as both a master and a slave. The four I
Slave Transmit, and Slave Receive.
A Stellaris
Both the I
a transmit or receive operation completes (or aborts due to an error). The I
interrupts when data has been sent or requested by a master.
Controller Area Network (see page 413)
Controller Area Network (CAN) is a multicast shared serial-bus standard for connecting electronic
control units (ECUs). CAN was specifically designed to be robust in electromagnetically noisy
environments and can utilize a differential balanced line like RS-485 or a more robust twisted-pair
wire. Originally created for automotive purposes, now it is used in many embedded control
applications (for example, industrial or medical). Bit rates up to 1Mb/s are possible at network lengths
below 40 meters. Decreased bit rates allow longer network distances (for example, 125 Kb/s at
500m).
A transmitter sends a message to all CAN nodes (broadcasting). Each node decides on the basis
of the identifier received whether it should process the message. The identifier also determines the
priority that the message enjoys in competition for bus access. Each CAN message can transmit
from 0 to 8 bytes of user information. The LM3S2651 includes one CAN units.
System Peripherals
Programmable GPIOs (see page 166)
General-purpose input/output (GPIO) pins offer flexibility for a variety of connections.
The Stellaris
individual GPIO port. The GPIO module is FiRM-compliant (compliant to the ARM Foundation IP
for Real-Time Microcontrollers specification) and supports 16-53 programmable input/output pins.
The number of GPIOs available depends on the peripherals being used (see “Signal Tables” on page
503 for the signals available to each GPIO pin).
The GPIO module features programmable interrupt generation as either edge-triggered or
level-sensitive on all pins, programmable control for GPIO pad configuration, and bit masking in
both read and write operations through address lines. Pins configured as digital inputs are
Schmitt-triggered.
Four Programmable Timers (see page 208)
Programmable timers can be used to count or time external events that drive the Timer input pins.
The Stellaris
block provides two 16-bit timers/counters that can be configured to operate independently as timers
2
C bus interfaces to external I
2
®
C master and slave can generate interrupts. The I
I
®
®
2
C module can operate at two speeds: Standard (100 Kbps) and Fast (400 Kbps).
GPIO module is comprised of eight physical GPIO blocks, each corresponding to an
General-Purpose Timer Module (GPTM) contains four GPTM blocks. Each GPTM
2
C bus can be designated as either a master or a slave. The I
2
C bus. The I
2
2
C bus supports devices that can both transmit and receive (write
C devices such as serial memory (RAMs and ROMs), networking
Preliminary
2
C module that provides the ability to communicate to other
2
2
C bus may also be used for system testing and
C modes are: Master Transmit, Master Receive,
2
C master generates interrupts when
2
C slave generates
2
C module supports
July 25, 2008